Wiktionary
timber rafting
n. A log transportation method in which logs are tied together into rafts and drifted or pulled across a water body or down a flatter river.
Wikipedia
Timber rafting
Timber rafting is a log transportation method in which logs are tied together into rafts and drifted or pulled across a water body or down a flatter river. It is arguably the second cheapest method of transportation of timber, next after log driving. Both methods may be referred to as timber floating.